Solid electrolyte type fuel battery

Abstract

A solid electrolyte type fuel battery in which a material for an interconnector for connecting cells of the solid electrolyte type fuel battery comprises a matrix of the general formula MTiO 3 , where M is an alkaline earth metal element such as Mg, Ca, Sr or Ba. This fuel battery can be produced by burning at a lower temperature of 1,300 to 1,400° C. than before, shows output performance comparable to or better than that of conventional devices, and has better durability and thermo cycle resistance characteristics than the conventional devices.

1. A solid electrolyte fuel battery, in which a co-sintered interconnector for connecting cells of the solid electrolyte fuel battery comprises a material having a matrix of the general formula A 1-x B x C 1-y D y O 3  where A is Ca, Sr or Ba, B is a rare earth element, aluminum or chromium, C is titanium, D is tantalum, 0<x≦0.2 and 0<y≦0.2. 
   
   
     2. The solid electrolyte fuel battery as claimed in  claim 1 , wherein the current passage of the interconnector is current collection in the vertical direction. 
   
   
     3. A solid electrolyte fuel battery, in which a co-sintered interconnector for connecting cells of the solid electrolyte fuel battery comprises a material having a matrix of the general formula A 1-x B x C 1-y D y O 3  where A is Mg, B is a rare earth element, aluminum or chromium, C is titanium, D is tantalum, 0<x≦0.2 and 0<y≦0.2. 
   
   
     4. The solid electrolyte fuel battery as claimed in  claim 3 , wherein the current passage of the interconnector is current collection in the vertical direction. 
   
   
     5. A method of making a solid electrolyte fuel battery, in which a co-sintered interconnector for connecting cells of the solid electrolyte fuel battery comprises a material having a matrix of the general formula A 1-x B x C 1-y D y O 3  where A is Ca, Sr or Ba, B is a rare earth element, aluminum or chromium, C is titanium, D is tantalum, 0<x≦0.2 and 0<y≦0.2, said method comprising:
 integrally burning within said battery the interconnector for connecting cells of the solid electrolyte fuel battery. 
 
   
   
     6. The method of making the solid electrolyte fuel battery as claimed in  claim 5 , wherein said battery comprises a fuel electrode, an electrolyte, an interconnector and an air electrode laminated onto a substrate. 
   
   
     7. A method of making a solid electrolyte fuel battery, in which a co-sintered interconnector for connecting cells of the solid electrolyte fuel battery comprises a material having a matrix of the general formula A 1-x B x C 1-y D y O 3  where A is Mg, B is a rare earth element, aluminum or chromium, C is titanium, D is tantalum, 0<x≦0.2 and 0<y≦0.2, said method comprising:
 integrally burning within said battery the interconnector for connecting cells of the solid electrolyte fuel battery. 
 
   
   
     8. The method of making the solid electrolyte fuel battery as claimed in  claim 7 , wherein said battery comprises a fuel electrode, an electrolyte, an interconnector and an air electrode laminated onto a substrate. 
   
   
     9. The method of  claim 5 , wherein the current passage of the interconnector is current collection in the vertical direction. 
   
   
     10. The method of  claim 7 , wherein the current passage of the interconnector is current collection in the vertical direction. 
   
   
     11. The method of  claim 5 , wherein the integrally burning is performed at a temperature of 1,300° C. to 1,400° C. 
   
   
     12. The method of  claim 7 , wherein the integrally burning is performed at a temperature of 1,300° C. to 1,400° C. 
   
   
     13. The solid electrolyte fuel battery as claimed in  claim 1 , wherein the interconnector is a hermetic interconnector having a relative density of greater or equal to 94%. 
   
   
     14. The solid electrolyte fuel battery as claimed in  claim 3 , wherein the interconnector is a hermetic interconnector having a relative density of greater or equal to 94%.